Israeli jets and helicopters launched dozens of air strikes across the Gaza Strip overnight on Monday, just hours after the bodies of three abducted Israeli teenagers were found in a shallow grave near the southern West Bank city of Hebron.

The air strikes, ostensibly in response to an ongoing barrage of rocket fire from Gaza into southern Israel, came after the Israeli prime minister, Binyamin Netanyahu, vowed the militant Islamist group Hamas, blamed by Israel for the kidnapping, would “pay a heavy price”.